Adjusting means for feed-screws.



P. SHAMPOU & DONAHUE.

ADJUSTING MEANS FOR FEED SCREWS.

APPLICATION FILED APR.22,1909.

Patented May 31, 1910.

PETER SHAMPOU AND ISAAC DONAHUE, OF WEBSTERVILLE, VERMONT, ASSIGNORS OFONE-THIRD TO JOSEPH BEDARD, 0F WEBSTERVILLE, VERMONT.

ADJUSTING MEANS FOR FEED-SCREWS.

To all whom it may concern: I

Be it known that we, PETER SHAMPoU, a citizen of the Dominion of Canada,and IsAAc DONAHUE, a citizen of the United States, both residing atlVebsterville, in the county of Vashington and State of Vermont, haveinvented certain new and useful Improvements in Adjusting Means forFeed-Screws, of which the following is a specification, reference beinghad to the accompanying drawings.

This invention relates to improvements in adjusting means for the feedscrews of mining drills and other machines.

The object of the invention is to provide a simple and practical devicewhich may be readily applied to any of the rock or mining drills now incommon use for the purpose of taking up the wear of the feed screw andnut and thereby prevent all lost motion and insuring a proper andeffective operation of the drill.

Vith the above and other objects in view, the invention consists of thenovel features of construction and the combination and arrangement ofparts hereinafter fully described and claimed, and illustrated in theaccompanying drawings, in which- Figure 1 is a View, partly in elevationand partly in section, showing the invention applied to a well knownform of mining drill; Fig. 2 is a side elevation of the feed nut of adrill with the invention applied thereto, a portion of the feed screwbeing also shown; and Fig. 3 is a longitudinal section through the partsshown in Fig. 2.

In the drawings 1 denotes a rock or mining drill of well known formhaving a sup-- port 2, a slidably mounted member 3 carrying the drilland a feed nut 1 which works on a feed screw 5 mounted in any suitablemanner in a cross bar 6 between two rods 7 projecting from the support 2and having a crank handle 8 at its rear end. The nut 4 is in the form ofa sleeve fixed in a lug 9 formed upon the slide 3, said sleeve nut beingretained in the lug by forming upon one end of the sleeve nut an annularflange 10 and externally screw threading its other end for the receptionof a retaining nut 11. The parts above described are old and well knownand form no part of the present invention.

Our invention is adapted to be applied to the parts above describedafter the nut and Specification of Letters Patent.

Application filed April 22, 1909.

Patented May 31, 1910.

Serial No. 491,465.

feed screw have become worn and there is lost motion at said parts inthe operation of the drill.

The invention comprises a supplemental feed nut 12 internally threadedto receive the feed screw 5, and suitable means for adjustably securingit to the nut 1 or other portion of the slide 3. The preferred form ofattaching and adjusting means for the supplemental feed nut is clearlyshown in Figs. 2 and 3 of the drawings and comprises a sleeve nut 13having a swiveled connection with the nut 12 and a threaded engagementwith the threaded end of the nut 4- The swiveled connection between thenut 12 and sleeve 13 is effected by forming the former with an outwardlyprojecting annular flange 1 1 which is arranged in the sleeve 13 andengages an inwardly projecting annular flange 15 in the form of a ringsecured by screws 15* in the end of said sleeve. The nut 12 isexternally screw threaded for the reception of a locking nut 16, whichlatter is screwed against the end of the sleeve 13 to prevent rotationof the nut 12. It will be seen that by adjusting said parts the nut 12may be moved toward the nut 4 so as to take up wear on the latter andthe feed screw and prevent any lost motion due to such wear. To permitthe nut 12 to be readily turned its outer portion is preferably formedat opposite points with flat faces 12 for the reception of the jaws of awrench or similar tool.

From the foregoing it will be seen that the invention provides anexceedingly simple and practical device of this character which may beapplied to any rock or mining drill employing a feed screw or nut and bymeans of which the wear 011 said parts may be quickly taken up toprevent looseness or lost motion and the resulting lack of efiiciency inthe operation of the drill.

Having thus described the invention what is claimed is:

1. The combination of a feed screw and its nut, the latter having anexternally screw threaded portion at one end, a supplemental nut engagedwith the screw and having an externally screw threaded portion, a sleevenut having a swiveled connection with said supplemental nut, and havingits internal screw threads engaged with the external screw threads onthe end of the first mentioned nut, and a clamping nut engaged with theexternal screw threads of said supplemental nut for locking saidswiveled connection.

2. The combination of a feed screw and its nut, the latter having anexternally screw threaded portion at one end, a supplemental nut formedat one end with an annular outwardly projecting flange, at its other endwith fiat faced portions, and on its intermediate portion with externalscrew threads, a sleeve nut internally threaded to engage the threadedend of the first mentioned nut, said sleeve nut being formed at one endwith a concentric recess to receive the flange of the supplemental nut,aring secured in said recess of the sleeve nut, and a clamping nut 5engaged with the external screw threads of the supplemental nut tofrictionally lock said sleeve and supplemental ends.

In testimony whereof we hereunto afliX our signatures in the presence oftwo wit- 20

